yashsingh1/xdaforums huggingface dataset:
[Nook Color General] TDO:
I get the following resulst with my new second Samsung Class 10 card.

Samsung Class 10

MB-MSBGA/EU

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 20.108 MB/s

Sequential Write : 12.312 MB/s

Random Read 512KB : 19.856 MB/s

Random Write 512KB : 12.051 MB/s

Random Read 4KB (QD=1) : 4.526 MB/s [ 1104.9 IOPS]

Random Write 4KB (QD=1) : 1.372 MB/s [ 334.9 IOPS]

Random Read 4KB (QD=32) : 4.722 MB/s [ 1152.8 IOPS]

Random Write 4KB (QD=32) : 1.371 MB/s [ 334.8 IOPS]

Test : 50 MB [I: 0.0% (0.0/29.2 GB)] (x5)

Date : 2012/03/12 14:16:16
[Nook Color General] Sm!th:
Benchmarks to report

I had a Lexar 32GB Class 10 that I was using on my NookColor. Since then I got wiser and bought a SanDisk Class 6. Here are the benchmarks:

SanDisk Mobile Ultra 32GB Micro SDHC Flash Card Model SDSDQY-032G-A11A

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.867 MB/s
Sequential Write : 9.012 MB/s
Random Read 512KB : 19.454 MB/s
Random Write 512KB : 3.746 MB/s
Random Read 4KB (QD=1) : 3.610 MB/s [ 881.4 IOPS]
Random Write 4KB (QD=1) : 1.543 MB/s [ 376.7 IOPS]
Random Read 4KB (QD=32) : 3.842 MB/s [ 938.0 IOPS]
Random Write 4KB (QD=32) : 1.594 MB/s [ 389.0 IOPS]

Test : 50 MB [E: 6.8% (7.9/115.8 MB)] (x5)
Date : 2012/03/12 9:25:35
OS : Windows 7 SP1 [6.1 Build 7601] (x64)

SanDisk Mobile Ultra 16GB Micro SDHC Flash Card Model SDSDQY-016G-A11A

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.111 MB/s
Sequential Write : 8.513 MB/s
Random Read 512KB : 18.801 MB/s
Random Write 512KB : 3.787 MB/s
Random Read 4KB (QD=1) : 3.558 MB/s [ 868.6 IOPS]
Random Write 4KB (QD=1) : 1.978 MB/s [ 482.8 IOPS]
Random Read 4KB (QD=32) : 3.643 MB/s [ 889.4 IOPS]
Random Write 4KB (QD=32) : 1.323 MB/s [ 322.9 IOPS]

Test : 50 MB [E: 3.6% (2.7/74.8 MB)] (x5)
Date : 2012/03/02 10:19:10
OS : Windows 7 SP1 [6.1 Build 7601] (x64)

Lexar High Speed MicroSDHC 32 GB Class 10 Flash Memory Card with Reader LSDMI32GBSBNAR

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.872 MB/s
Sequential Write : 11.770 MB/s
Random Read 512KB : 19.539 MB/s
Random Write 512KB : 1.553 MB/s
Random Read 4KB (QD=1) : 3.933 MB/s [ 960.3 IOPS]
Random Write 4KB (QD=1) : 0.013 MB/s [ 3.2 IOPS]
Random Read 4KB (QD=32) : 4.027 MB/s [ 983.3 IOPS]
Random Write 4KB (QD=32) : 0.027 MB/s [ 6.7 IOPS]

Test : 50 MB [H: 19.0% (5.7/29.8 GB)] (x5)
Date : 2012/02/28 13:57:16
OS : Windows 7 SP1 [6.1 Build 7601] (x64)
[Nook Color General] waxhell:
Updated the spreadsheet again, and also added in some more of my own results:

Sandisk Class 4, 16GB (SDSQ-016G-A11M) -- My 2nd CL4/16GB Card

Sequential Read : 22.479 MB/s

Sequential Write : 4.849 MB/s

Random Read 512KB : 21.965 MB/s

Random Write 512KB : 2.921 MB/s

Random Read 4KB (QD=1) : 4.085 MB/s [ 997.2 IOPS]

Random Write 4KB (QD=1) : 1.158 MB/s [ 282.7 IOPS]

Random Read 4KB (QD=32) : 4.189 MB/s [ 1022.7 IOPS]

Random Write 4KB (QD=32) : 0.824 MB/s [ 201.2 IOPS]

Test : 50 MB [E: 20.0% (3.0/14.8 GB)] (x5)

Date : 2012/03/29 12:29:23

OS : Windows 7 SP1 [6.1 Build 7601] (x64)
[Nook Color General] freonchill:
sandisk 32gb cl4, bought on 1saleaday.com

need a magnifying glass to see the actual model # (will update post when found out)

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 20.062 MB/s
Sequential Write : 5.158 MB/s
Random Read 512KB : 19.514 MB/s
Random Write 512KB : 3.095 MB/s
Random Read 4KB (QD=1) : 3.191 MB/s [ 779.1 IOPS]
Random Write 4KB (QD=1) : 1.266 MB/s [ 309.1 IOPS]
Random Read 4KB (QD=32) : 3.405 MB/s [ 831.3 IOPS]
Random Write 4KB (QD=32) : 1.025 MB/s [ 250.3 IOPS]

Test : 50 MB [W: 0.0% (0.0/29.7 GB)] (x5)
Date : 2012/03/29 15:23:36
OS : Windows 7 SP1 [6.1 Build 7601] (x64)

update 4/1

got my camera out and took a picture of the 8gb / 16gb / 32gb sandisk micro-sdhc cards

the silk screen has the serial number and

the 16gb / 32gb say "BN MADE IN CHINA" (see attached image, serial blanked)

the 8gb only says "MADE IN CHINA"

there is nothing on the back of any of them, other than what appears to be a small square of black tape that you can see several indentations (or perhaps raised square dots)

i got the 8gb from ebay seller dailysteals 2/12

i got the 16gb from From "everything but the stromboli" on Amazon 7/11

i got the 32gb from 1saleaday.com 3/12

the speed of all of sandisk's are pretty good, so i am guessing that they are not fake

whats everyone else's sandisk's say? does the actual chip have the model number - e.g. "SDSDQM-032G" or similar on it? or do you know that just from what the packaging / seller says that the item is? the high quality images on newegg show "BM MADE IN CHINA" on most of the sandisk models. the sandisk "ultra mobile" cl6 have the silkscreen serial number and "MADE IN CHINA" on the back rather than on the front.
[Nook Color General] DiscMan55:
Hello,

PNY Class 6 microSD with SD adapter

Rev: 02, Made in Taiwan, 8 GB, Class 6

Now functioning as my permanent laptop ReadyBoost :-) (in a Dell E5500)

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 13.974 MB/s
Sequential Write : 10.705 MB/s
Random Read 512KB : 13.965 MB/s
Random Write 512KB : 2.084 MB/s
Random Read 4KB (QD=1) : 8.122 MB/s [ 1982.8 IOPS]
Random Write 4KB (QD=1) : 0.020 MB/s [ 4.8 IOPS]
Random Read 4KB (QD=32) : 8.627 MB/s [ 2106.1 IOPS]
Random Write 4KB (QD=32) : 0.017 MB/s [ 4.3 IOPS]

Test : 100 MB [M: 0.0% (0.1/7782.0 MB)] (x5)
Date : 2012/04/01 17:08:51
OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x86)
PNY Class 6 8GB, Rev 02, Made in Taiwan
[Nook Color General] ruhtra:
more Sandisk benchmarks

Thanks for the great list. Here's some more including the finely printed numbers on the cards.

Sandisk 32GB Class 4 Micro SDHC

1202608505D7P BD Made in China

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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 18.156 MB/s

Sequential Write : 4.899 MB/s

Random Read 512KB : 13.056 MB/s

Random Write 512KB : 2.772 MB/s

Random Read 4KB (QD=1) : 1.522 MB/s [ 371.5 IOPS]

Random Write 4KB (QD=1) : 0.825 MB/s [ 201.5 IOPS]

Random Read 4KB (QD=32) : 1.924 MB/s [ 469.7 IOPS]

Random Write 4KB (QD=32) : 0.594 MB/s [ 145.1 IOPS]

Test : 50 MB [F: 3.3% (1.0/29.7 GB)] (x5)

Date : 2012/04/14 13:49:08

OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

Sandisk Micro SDHC 16GB Class 4

1132908097S646 BL Made in Taiwan

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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 12.024 MB/s

Sequential Write : 4.751 MB/s

Random Read 512KB : 11.634 MB/s

Random Write 512KB : 2.822 MB/s

Random Read 4KB (QD=1) : 1.308 MB/s [ 319.4 IOPS]

Random Write 4KB (QD=1) : 0.784 MB/s [ 191.5 IOPS]

Random Read 4KB (QD=32) : 1.440 MB/s [ 351.7 IOPS]

Random Write 4KB (QD=32) : 0.631 MB/s [ 154.0 IOPS]

Test : 50 MB [F: 0.0% (0.0/14.8 GB)] (x5)

Date : 2012/04/14 14:04:54

OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)
[Nook Color General] KidJoe:
Sandisk 64G MicroSDXC Class6 SDSDQY-064G-A11A (purchased at BestBuy)

Fresh out of the box (formatted as exFAT)

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.651 MB/s

Sequential Write : 8.584 MB/s

Random Read 512KB : 19.202 MB/s

Random Write 512KB : 3.630 MB/s

Random Read 4KB (QD=1) : 3.112 MB/s [ 759.7 IOPS]

Random Write 4KB (QD=1) : 1.169 MB/s [ 285.5 IOPS]

Random Read 4KB (QD=32) : 3.364 MB/s [ 821.4 IOPS]

Random Write 4KB (QD=32) : 1.104 MB/s [ 269.5 IOPS]

Test : 50 MB [L: 0.0% (0.0/59.4 GB)] (x5)

Date : 2012/04/27 19:14:49

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

Same card formatted FAT32

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.730 MB/s

Sequential Write : 9.263 MB/s

Random Read 512KB : 19.252 MB/s

Random Write 512KB : 4.731 MB/s

Random Read 4KB (QD=1) : 3.147 MB/s [ 768.3 IOPS]

Random Write 4KB (QD=1) : 1.157 MB/s [ 282.4 IOPS]

Random Read 4KB (QD=32) : 3.408 MB/s [ 832.1 IOPS]

Random Write 4KB (QD=32) : 1.200 MB/s [ 293.0 IOPS]

Test : 50 MB [M: 0.0% (0.0/59.5 GB)] (x5)

Date : 2012/04/27 19:40:37

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

NOTE: tests were performed using an older Sandisk SD-113 reader that came with one of my older uSD cards, but the adapter that came with the uSDXC card.
[Nook Color General] flatulatorx:
my 2nd Samsung uSD class 10

Similar performance to my 1st card (post #331) :D. Bought from a different ebay seller from Korea. Tested under same conditions -- straight out of the retail pkg and in a Sandisk Extreme Pro SDXC expresscard reader.

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World : crystalmark.xxx

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 23.437 MB/s

Sequential Write : 12.122 MB/s

Random Read 512KB : 23.038 MB/s

Random Write 512KB : 11.937 MB/s

Random Read 4KB (QD=1) : 7.231 MB/s [ 1765.5 IOPS]

Random Write 4KB (QD=1) : 1.252 MB/s [ 305.6 IOPS]

Random Read 4KB (QD=32) : 8.048 MB/s [ 1964.8 IOPS]

Random Write 4KB (QD=32) : 1.281 MB/s [ 312.8 IOPS]

Test : 50 MB [M: 0.0% (0.0/29.2 GB)] (x5)

Date : 2012/05/02 16:26:46

OS : Windows 7 SP1 [6.1 Build 7601] (x64)

Samsung uSD 32GB class10 (Korea) card#2 May'12
[Nook Color General] Dave_001:
I tested both my 16gb cards today, using Windows 7 with the card in the phone, then in a USB reader, and Windows XP with the card in the phone, then in a USB reader, I used the 32 bit version of CrystalDiskmark (5/50) for all tests.

I got different results with each setup.
[Nook Color General] ewichern:
PNY 32GB class10 High Speed Micro SDHC P-SDU32G10-EFS2

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World :
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 18.336 MB/s
Sequential Write : 7.198 MB/s
Random Read 512KB : 18.059 MB/s
Random Write 512KB : 0.598 MB/s
Random Read 4KB (QD=1) : 2.775 MB/s [ 677.5 IOPS]
Random Write 4KB (QD=1) : 0.465 MB/s [ 113.4 IOPS]
Random Read 4KB (QD=32) : 2.217 MB/s [ 541.3 IOPS]
Random Write 4KB (QD=32) : 0.348 MB/s [ 84.9 IOPS]

Test : 50 MB [L: 8.1% (2.4/30.0 GB)] (x5)
Date : 2012/05/09 17:15:12
OS : Windows 7 SP1 [6.1 Build 7601] (x64)

ugh. Random writes could be a lot worse, but not great numbers overall.
[Nook Color General] zaggaza:
Ok. Read through 35 pages. Consensus Sandisk -- class 2 or 4. 8gb or 16gb? Depends on the card...

Is there an actual rationale for why this is so?:o
[Nook Color General] freonchill:
different factory, different yield, perhaps even real verses fake.
[Nook Color General] old_fart:
yaa, the sd card's utility has to meet the tablet designer wishes... they set up windows of fetching. . the tab wishes to do a LOT of random i/o and does not care too much about fast sequential .
[Nook Color General] soobaerodude:
SanDisk Mobile Ultra UHS-I, class 10 microSD

The Samsung class 10 has a competitor, the SanDisk Mobile Ultra UHS-I, class 10 microSD!

SanDisk's description of the card

Benchmarks for the 32GB, item# SDSDQUA-032G-A11A, USB 2.0 reader connected to USB 3.0 port

Sequential Read : 18.372 MB/s
Sequential Write : 13.057 MB/s
Random Read 512KB : 18.703 MB/s
Random Write 512KB : 8.554 MB/s
Random Read 4KB (QD=1) : 3.150 MB/s [ 769.0 IOPS]
Random Write 4KB (QD=1) : 1.957 MB/s [ 477.8 IOPS]
Random Read 4KB (QD=32) : 3.590 MB/s [ 876.4 IOPS]
Random Write 4KB (QD=32) : 1.960 MB/s [ 478.5 IOPS]

Test : 50 MB [D: 0.0% (0.0/29.7 GB)] (x5)
[Nook Color General] leistungssurrogat:
64GB SanDisk Mobile Ultra UHS-I microSDHC Class 6

These are the results for the 64GB SanDisk Mobile Ultra UHS-I microSDHC Class 6 (SDSQY-064G-U46A) tested with the internal card reader of my notebook:

Sequential Read : 20.111 MB/s
Sequential Write : 8.460 MB/s
Random Read 512KB : 19.676 MB/s
Random Write 512KB : 2.405 MB/s
Random Read 4KB (QD=1) : 2.794 MB/s [ 682.1 IOPS]
Random Write 4KB (QD=1) : 1.280 MB/s [ 312.4 IOPS]
Random Read 4KB (QD=32) : 3.660 MB/s [ 893.6 IOPS]
Random Write 4KB (QD=32) : 1.397 MB/s [ 341.1 IOPS]
[Nook Color General] flatulatorx:
16GB Samsung Class 10 = epic fail

Having had such good experience with Samsung 32GB class 10's (see my previous 2 posts), I thought I'd give their 16GB card a try. It's marketed along with their esteemed 32GB class10, but rated at almost twice the write speed (21mb/s vs 13 mb/s). Turns out this extreme write speed pertains strictly to sequential writes.

So, I was in for a shock when I saw the large block random write speed, then nearly fainted at the sight of the small block random write speed. Ran the test twice to be sure.

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 23.212 MB/s

Sequential Write : 20.712 MB/s

Random Read 512KB : 22.219 MB/s

Random Write 512KB : 2.152 MB/s

Random Read 4KB (QD=1) : 3.409 MB/s [ 832.2 IOPS]

Random Write 4KB (QD=1) : 0.024 MB/s [ 5.9 IOPS]

Random Read 4KB (QD=32) : 3.614 MB/s [ 882.4 IOPS]

Random Write 4KB (QD=32) : 0.042 MB/s [ 10.3 IOPS]

Test : 50 MB [H: 0.0% (0.0/15.1 GB)] (x5)

Date : 2012/06/27 17:34:12

OS : Windows 7 SP1 [6.1 Build 7601] (x64)

Samsung uSD 16GB class10 (Korea) Jun'12

(Tested straight out of retail pkg on a Sandisk Extreme Pro expresscard reader).

Looking back at previous tests of my various cards, I got similarly poor random write results with 2 other cards that also had very high (17mb/s or higher) sequential write speeds -- a Lexar 128GB SDXC class10 and a Sandisk Ultra uSD class4.

This is an admittedly small sample, but the moral of the story for me is that the premise that cards with high sequential write speed have low random write speeds is sort of true, but only for extreme sequential write speeds. You can still get good random write speeds with good (but not extreme) sequential write speeds (from top tier manufacturers at least).

Very interesting results from soobaerodude's Sandisk Ultra UHS-1 card. I'll have to give that one a try.
[Nook Color General] stolenmoment:
I'm a bit reluctant to resurrect an old thread, but does anybody have stats like this for the internal emmc?

Or a native app that can be told to look at both?
[Nook Color General] solidsnake0928:
I have not seen a native app that can test read/write speeds on Android, but I do know that because CDM is a Windows program it cannot test the emmc because it is not mounted as a logical drive when tethered to your computer.

From what I have gleened, the internal memory on any Android device would have to be unmounted from the device for your PC to mount it.
[Nook Color General] tonestertm:
Sandisk 32GB Class 10 UHS-1 SDSDQU-032G-AC11A

Sandisk 32GB Class 10 UHS-1 SDSDQU-032G-AC11A

Purchased at Costco. (Made in China)

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

Sequential Read : 14.015 MB/s

Sequential Write : 10.198 MB/s

Random Read 512KB : 14.094 MB/s

Random Write 512KB : 9.064 MB/s

Random Read 4KB (QD=1) : 2.978 MB/s [ 727.2 IOPS]

Random Write 4KB (QD=1) : 1.359 MB/s [ 331.9 IOPS]

Random Read 4KB (QD=32) : 2.923 MB/s [ 713.5 IOPS]

Random Write 4KB (QD=32) : 1.401 MB/s [ 342.0 IOPS]

This is a good representation of multiple tests on the card as new

and

after used for a (successful) test CM10 install then repartitioned/reformatted as a single partition.
[Nook Color General] solidsnake0928:
What brand, class and size is that card?
[Nook Color General] tobydjones:
There's quite a lot of data on this thread that's not in the spreadsheet. Is it being updated, or is there a fresher version somewhere please?
[Nook Color General] SacTappingUni:
Anyone know if this applies to the cm10 builds available for the NC? I'm considering getting the aforementioned SD card now. I just want to make sure that it'll actually do what it's supposed to do.
[Nook Color General] leapinlar:
Yes, this applies to any ROM you want to put on SD. The card recommendations, that is.
[Nook Color General] tonestertm:
Sorry, I had typed it in, must have pasted over it. :( That's the Sandisk 32GB Class 10 card currently being sold at Costco. Don't have the complete model number with me at the moment. I'll edit it in later.

Edit: OK, that's weird... the info was there in the subhead the whole time, but for some reason it's not showing on my tapatalk...?
[Nook Color General] solidsnake0928:
Those are really good 4kb speeds for a class 10 card. SanDisk is definitely the best card for the CM on Nook.
[Nook Color General] tonestertm:
Yep, they do something right inside there. My wife and I have both been on SanDisk 16GB Class 6 (also from Costco--specs somewhere upthread) for about the last year, no complaints. :knocking wood:
[Nook Color General] solidsnake0928:
Yeah, I am using a 16GB class 4 that i am using, and it is perfect so far.
[Nook Color General] drcameron:
G.Skill 16GB class 10 from newegg

Typical results from 2 cards as I am getting two new Nook tabs ready for Christmas. I took a gamble paying about $6.60 per card at Newegg. They are 16GB gskill class 10 cards. I'll have to see how the real performance goes. Benchmarks are below.

CrystalDiskMark 3.0.2 (C) 2007-2012 hiyohiyo

Test : 50 MB

Sequential Read : 19.802 MB/s

Sequential Write : 17.086 MB/s

Random Read 512KB : 19.415 MB/s

Random Write 512KB : 6.755 MB/s

Random Read 4KB (QD=1) : 3.877 MB/s [ 946.6 IOPS]

Random Write 4KB (QD=1) : 0.887 MB/s [ 216.6 IOPS]

Random Read 4KB (QD=32) : 4.201 MB/s [ 1025.7 IOPS]

Random Write 4KB (QD=32) : 1.338 MB/s [ 326.6 IOPS]
[Nook Color General] kkt12:
this is indeed a great card. I am getting similarly high scores. it's on sale right now on Newegg (I see your review there!), 15% off with included promo code.

http://www.newegg.com/Product/Produ...Micro SDHC Flash Card Model SDSDQUA-032G-A11A
[Nook Color General] bastard_hun:
QUMOX 32GB Class 6 Micro SD SDHC MicroSD Memory Card 32 GB

I ordered it from ebay before I even saw this topic, so it was a gamble. It was approx 25$

Fortunately luck was on my side :)

These are the results with a really crappy chinese card reader:

-----------------------------------------------------------------------

CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyo

Crystal Dew World :

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 16.320 MB/s

Sequential Write : 7.298 MB/s

Random Read 512KB : 16.469 MB/s

Random Write 512KB : 12.371 MB/s

Random Read 4KB (QD=1) : 4.735 MB/s [ 1156.0 IOPS]

Random Write 4KB (QD=1) : 1.173 MB/s [ 286.3 IOPS]

Random Read 4KB (QD=32) : 5.969 MB/s [ 1457.3 IOPS]

Random Write 4KB (QD=32) : 1.599 MB/s [ 390.3 IOPS]

Test : 50 MB [E: 0.0% (0.0/29.7 GB)] (x5)

Date : 2013/02/09 9:16:08

OS : Windows Server 2008 R2 Enterprise Edition (Full installation) SP1 [6.1 Build 7601] (x64)
[Nook Color General] Socket:
High failure rate on Sandisk Mobile Ultra 20SDSDQUA-032G-A11A?

Based on this post I just ordered this card (from Amazon). Hasn't arrived yet.

I just now looked through the reviews over on Newegg, using the link below. Soobaerodude's review there was one of the first, posted back in May 2012 and things looked rosy then. But since that time, there have been a LOT (like about half of all the reviews) that indicate this card either failed immediately, or failed within 2-3 months

I'd be interested to hear from people here who bought this specific card (20SDSDQUA-032G-A11A) and have more than 2 months under their belt. Is it working ok? Soobaerodude, how about you? I'm worried I'm heading for the same problems...

Thanks
[Nook Color General] Socket:
Sandisk 32GB Ultra UHS-1 MicroSD Card arrived, here are my initial performance testing results.

5 iterations, 50 MB test file.

-----------------------------------------------------------------------

CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyo

Crystal Dew World : http://crystalmark.info/

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 21.722 MB/s

Sequential Write : 12.715 MB/s

Random Read 512KB : 21.309 MB/s

Random Write 512KB : 12.037 MB/s

Random Read 4KB (QD=1) : 5.631 MB/s [ 1374.8 IOPS]

Random Write 4KB (QD=1) : 1.837 MB/s [ 448.5 IOPS]

Random Read 4KB (QD=32) : 5.163 MB/s [ 1260.5 IOPS]

Random Write 4KB (QD=32) : 2.091 MB/s [ 510.5 IOPS]

Test : 50 MB [M: 0.0% (0.0/29.7 GB)] (x5)

Date : 2013/02/24 13:33:39

OS : Windows 7 Home Premium Edition [6.1 Build 7600] (x64)

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This was run using a USB3.0 port on my PC but with a USB2.0 to MicroSD adapter (the compact keychain type).

I also ran 3 other benchmarks using other connection methods like the included Sandisk SD-to-MicroSD card adapter inserted into my PC's built-in memory card reader, using a Kingston SD-to-MicroSD card adapter in that same PC reader, etc. No single test run was consistently better than the others considering all 8 test results.. some where higher, some were lower. The one I was most interested in -- Random Write 4KB (QD=32) -- varied from 1.783 to 2.195.

We'll see how much better CMv10-on-ext-SD works for me on that card once I get my current 8G card content migrated over to it.

Also, I guess I'll just have to wait and see if this card will die on me in a month or two like many reviews on newegg stated, or will last longer.
[Nook Color General] BleedingIris:
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